[quote=BB]
Are the souls the Kishin nom'd still around after they nom them and they're just "abosrbed"? Or are they just processed.
[/quote]

Yeah, Stein's condition would depend on that. 

Aqua Vitae should return Kishin Asura to the state of being Asura of the great powerful warriors. It's basically like a filter that removes anything harmful, like "insanity" or "a lack of a heart". What is the "natural state" of being has no relation to what Aqua Vitae does - Kishin Asura would have all of his mental defects and insanity removed. 

However, the reason why BB asked that question was if the soul eating condition for Asura to go insane crazy Kishin again - the souls he devoured - are still around inside of him, then what would happen is he would just transform into a Kishin all over again after Aqua Vitae dries